Using examples, explain any 3 factors that differentiate a hard real-time systemfrom a soft real-time system.

Deadline Handling: In a hard real-time system, missing a deadline is considered a total system failure. For example, in an air traffic control system, a delay in processing radar data could lead to catastrophic results. On the other hand, in a soft real-time system, missing a deadline is undesirable but it does not cause a system failure. For instance, in a video streaming service, a delay in packet delivery might cause a temporary glitch in the video but it won't stop the service entirely.

Predictability: Hard real-time systems require a high level of predictability. They need to guarantee that tasks will be completed within a specified time frame. For example, in a car's airbag system, the airbag must deploy within a certain time after a collision is detected. In contrast, soft real-time systems can tolerate some level of unpredictability. For instance, in an online gaming system, there might be some lag in updating player movements, but this won't necessarily ruin the game.

Consequences of Failure: The consequences of failure in a hard real-time system can be severe and life-threatening. For example, in a pacemaker, failure to stimulate the heart in a timely manner can be fatal. In a soft real-time system, the consequences of failure are usually less severe. For example, in a stock trading system, a delay in updating stock prices might result in financial loss, but it won't endanger lives.

Deadline Requirements: In a hard real-time system, tasks must be completed within a strict deadline. Failure to meet the deadline can result in catastrophic consequences. For example, in an air traffic control system, if the system fails to respond in real-time, it could lead to accidents. On the other hand, in a soft real-time system, missing a deadline is undesirable but it does not lead to any catastrophic result. For instance, in a video streaming service, if a frame is not displayed in time, it may lead to a temporary glitch in the video but it won't cause any severe damage.

Predictability: Hard real-time systems require a high level of predictability. The system must guarantee that critical tasks will be executed on time. For example, in a nuclear power plant control system, the system must predict and respond to any anomalies in real-time to prevent any mishaps. In contrast, soft real-time systems can tolerate some level of unpredictability. For example, in an online gaming system, some delay in the response time can be tolerated without significantly affecting the overall gaming experience.

Consequences of Failure: The consequences of failure in a hard real-time system can be disastrous and potentially life-threatening. For example, in a pacemaker, failure to stimulate the heart in real-time can be fatal. In a soft real-time system, the consequences of failure are usually not as severe. For example, in a stock trading system, failure to execute a trade in real-time may result in financial loss, but it is not life-threatening.